Cryptic crossword clue
Nero apt to fiddle — behaviour of psychological significance 7

The most common and most likely answer to this crossword clue is the 7 letter word OPERANT

I've seen this crossword clue in The Daily Telegraph
O
P
E
R
A
N
T

Buddy explains!

The straight part
We know that "behaviour of psychological significance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case behaviour of psychological significance = operant.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does OPERANT mean?

OPERANT noun
  1. An operative person or thing.
  2. Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
OPERANT adjective
  1. That operates to produce an effect.

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